chore: fix license, add disclaimer, quick start, GitHub topics, issue templates

.github/ISSUE_TEMPLATE/improve-skill.md

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+---
+name: Improve existing skill
+about: Suggest improvements to an existing skill
+title: '[IMPROVE] skill-name-here'
+labels: 'enhancement'
+assignees: ''
+---
+
+## Skill to improve
+<!-- Folder name of the skill -->
+
+## What needs improvement?
+- [ ] agent.py has errors or placeholders
+- [ ] api-reference.md is incomplete
+- [ ] SKILL.md frontmatter is missing fields
+- [ ] ATT&CK mapping is incorrect
+- [ ] Other:
+
+## Suggested improvement

.github/ISSUE_TEMPLATE/new-skill.md

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+---
+name: Add new skill
+about: Propose a new cybersecurity skill for the database
+title: '[NEW SKILL] skill-name-here'
+labels: 'new-skill, good first issue'
+assignees: ''
+---
+
+## Skill name (kebab-case)
+<!-- e.g., detecting-lateral-movement-in-azure -->
+
+## Domain / Subdomain
+<!-- e.g., cybersecurity / threat-hunting -->
+
+## Description
+<!-- One sentence describing what this skill does -->
+
+## MITRE ATT&CK techniques
+<!-- e.g., T1021.001, T1078.004 -->
+
+## NIST CSF function
+<!-- Identify, Protect, Detect, Respond, or Recover -->
+
+## Why is this skill needed?
+<!-- What problem does it solve for security practitioners? -->